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Lysosome
A membrane-bound cell organelle that contains digestive enzymes and breaks down excess or worn-out cell parts, food particles, and invading viruses or bacteria.
Active Transport
The passage of molecules over a cell's membrane, moving from an area of decreased concentration to an area of increased concentration, an endeavor that utilizes energy.
Concentration Gradient
A difference in the concentration of a substance across a distance, which can drive diffusion of particles from an area of high concentration to an area of lower concentration.
Carrier Molecules
Proteins that assist in moving substances through a cell membrane by altering their form or attaching to the substance.
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